<template>
  <view>
    <!-- 使用自定义的搜索组件 -->
    <!-- <my-search :bgcolor="'pink'" :radius="3"></my-search> -->
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <scroll-view class='left-scroll-view' scroll-y="true" :style="{height:wh+'px'}">
        <block v-for='(item,i) in cateList' :key='i'>
          <view :class="['left-scroll-view-item',active===i?'active':'']" @click='activeChanged(i)'>{{item.cat_name}}</view>
        </block>
      </scroll-view>  
      <!-- 右侧的滑动区域 -->
      <scroll-view scroll-y="true" :style="{height:wh+'px'}" :scroll-top="screenTop">
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key='i2'>
          <!-- 二级分类的标题 -->
          <view class="cate-lv2-title">/{{item2.cat_name}}/</view>
          <!--  二级分类下的三级分类的分类列表 -->
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodList(item3)">
              <image :src="item3.cat_icon"></image>
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from "@/mixins/tabbar-badge.js"
  export default {
    mixins:[badgeMix],
    data() {
      return {
        // 当前设备可用的高度
        wh:0,
        cateList:[],
        // 激活
        active:0,
        // 二级分类
        cateLevel2:[],
        screenTop:0
      };
    },
    onLoad(){
      const sysInfo=uni.getSystemInfoSync()
      this.wh=sysInfo.windowHeight
      
      this.getCateList()
    },
    methods:{
      // 获取分类列表的数据
      async getCateList(){
        const {data:res}=await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status!==200) return uni.$showMsg()
        this.cateList=res.message
        
        // 二级分类赋值
        this.cateLevel2=res.message[0].children
      },
      // 激活
      activeChanged(i){
        this.active=i
        
        // 重新为二级分类赋值
        this.cateLevel2=this.cateList[i].children
        
        this.screenTop=this.screenTop===0?1:0
      },
      // 跳转到商品列表页面
      gotoGoodList(item){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid='+item.cat_id
        })
      },
      gotoSearch() {
        uni.navigateTo({
          url: '/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container{
    display: flex;
    .left-scroll-view{
      width:120px
    }
    .left-scroll-view-item{
      background-color: #F7F7F7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      
      &.active{
        background-color:#FFFFFF;
        position: relative;
        
        &::before{
          content: ' ';
          display: block;
          width:3px;
          height: 39px;
          background-color: #C00000;
          position: absolute;
          top:50%;
          left:0;
          transform: translateY(-50%);
        }
      }
    }
  }
  .cate-lv2-title{
    font-size:12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }
  .cate-lv3-list{
    display: flex;
    flex-wrap: wrap;
    
    .cate-lv3-item{
      width:33.33%;
      display: flex;
      flex-direction: column;
      align-items:center;
      margin-bottom: 10px;
      
      image{
        width:60px;
        height: 60px;
        border:1px solid red
      }
      text{
        font-size: 12px;
      }
    }
  }
</style>
